can personally recommend Hotel Ses Estaques at Santa Eulalia. Its a Thompson Gold hotel and is adults only. However the average age is close to 50, but its adults only.The food is excellent,entertainment during the day,with shows and cabarat at night.Its ideal watching the shows in the outdoor entertainment area with the Mediteranian laping 20 yards behind.The marina is at one side so the hotel stands slightly alone but its only 10 minutes walk to the centre with its up market shops and promenade ---plus extensive sandy beach with shallow bathing..
The Ses Estaques does not have much of a beach front, although you can swim from there. A good beach is only 50 yards away.
The Panorama Marina at Es Cana (Approx 2 miles Away )again is Thompson Gold and from own experiences is excellent --- between the two hotels there is little to choose, but Santa Eulalia is more developed and up market, But on that hot summers evening for me the Ses Estaques scores when you can sit drinking (Bacardi and coke ) with a gentle sea breeze and the sound of the med behind you.The Panorama Marina pool area and outdoor entertainment complex is "inset "so you dont get that gentle cooling breeze Good when its windy though.All these resorts are easilly visited by water taxi. equally its a pleasant walk between the two.
Ibiza is a wonderful green island with lots to see.. Where ever you go hopefully you will enjoy. Let us know.